code: def get_tr_dataset_size_from_z0(z0):
      """Returns the training dataset size."""
      return int(np.round(np.exp(z0)))
  
file_path: dragonfly/examples/tree_reg/skltree.py
imports: from __future__ import print_function
  import numpy
  from sklearn import ensemble
label_desc: Use image node_id 1 for calling a global function with example usage: get_tr_dataset_size_from_z0(z0) and returns: int